Lee mttbdock



L. MURDOCK.

WRENCH.

APPLICATION FILED use. 23. ms.

1 ,3 1 5 ,787 Patented Sept. 9, 1919.

.l 66 fiardacgw mentor,

1m: COLUMBIA PLANmlAr'n C0. WAsIIINnTD I) c.

LEE MURDOCK, OFlW AYINESIBURG, PENNSYLVANIA.

f wnnn'cn.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filed December 2a, 1918. Serial No. 267,983.

To all whom it may concern Be it known that I, LEE MURDOCK, a citizen ofthe United States, residing at Waynesburg, in the county of Greene andState of Pennsylvania, have invented certain new and useful Improvementsin Wrenches, of which the following is a specification.

This invention has reference generally to improvements in that class ofinventions known as tools and more particularly relates to an improvedwrench. p

The primary aim and object of this invention is to provide a dcviceofthe above mentioned character designed to beused for turning pipesections relative to each other while acting in conjunction therewithisan adjustable element for releasably holding the parts in a setposition so that the device may be used for adjusting nuts et cetera.

More particularly, this invention contemplates the provision of a deviceoftheabove mentioned character embodying a shank and relatively movablejaws, one of the jaws being designed for movable and adjustableengagement on the shank while the remaining jaw is movably mounted onthe first mentioned. movable jaw, both ofthe jaws coactin with a camhead on the shank for insuring of an effective adjustment or turn- 30ing of a pipe section relative to another pipe section. i 1 i It. is amorespecific object of this invention to provide a device of. the abovementioned character wherein the shank and the two jaws are of novelconstructionand these component parts are designed to peculiarly coactwith each other for producing an elfective wrench. a

Among the other aims and objects of this invention may be recited theprovision of a device of the above mentioned character wherein thenumber of parts are. comparatively few, the construction simple, thecost of production low and the efficiency high.

Other objects, as well as the nature, characteristic features and scopeof thisinvention will be more readily apparent from the followingdescription taken in connection with the accompanying drawings andpointed out in the claims, forming a part of: this specification.

The invention is clearly illustrated in the accompanying drawings, inwhiche- Figure 1 is a sideelevation ofthe invention the outer movablejaw being shown in section, i

is a plan view of the improved Similar. characters of reference areemployed in all of the above described views, to indicate correspondingparts.

Referring now, more particularly, tothe accompanying drawings, there isprovided a shank 1 formed of metal desirably stra1ght,,one end thereofbeing slightly re duced as at 2 and formed with a slightly oil'- set dagonally disposed cam head 3. i

Movablymounted on the shank and coacting with the camhead is theinnermovable jaw'deslgnated generally by the numeral 4.

This jaw in the present instance is desirably of a substantially Lshaped configuration, the short portion 5 being provided with an opening6 therethrough, one wall of which is curved as at 7 for ridingengagement with the front face of the shank while the oppo- SE6 wallextends diagonally as at 8 toward the corner of the jaw. The longportion 9 of the aw {l is curved slightly inwardly as at 10 and has theterminal portions thereof curved slightly outwardly as at 11, while theouter face of this terminal portion is provided with teeth .12 forproviding in turn an engaging face for the jaw. In addition,

the short portion of the movable jaw 4 is curved to provide a cam face13 at the restrlcted ends of the openings 6 for coacting withtheadjacent faceof the cam head on the shank in a manner that will appear.

Coacting with the movable inner jaw and the cam head 3 is the movableouter jaw generally designated by the numeral 14 in the present instancebeing substantially L shaped or hook-shaped including a shank 15 and anangularly disposed head 16 the inner face of the head and shank beingformed withteeth 17 providing an engaging face for coacting with theengaging face 12,

while in addition the shank is provided near its opposite extremity withan opening 18 for. permitting of the'slidable disposition I of the jaw,1 1 about the long portion!) of the jaw 4. The width of the opening 18is substantially similar to the thickness of the portion 9 preventingrelative transverse movement. However, one side wall of the openingisout at an angle as at 19. while the opposite wall is abruptly rounded asat 20 for coacting with the inner face of the curved portion 10 whilethe inner edge of the portion 16 is curved providing a cam face 21 forcoacting with the cam head 3..

This cam face 21 is so related to the cam head :8 that the latter alsocoacts therewith preventing accidental displacement of the outerL-shaped jaw from the inner L-shaped 3 Suitable resilient means such asa leaf spring 22 is employed for yieldingly holding the cam face 13against the cam head 3 to, in consequence, insure of an engagementbetween the cam head 3 and the cam face 21 of the outer movable jaw,preventing the latter from being accidentally disengaged from the longportion9 of the said inner j aw 4. The spring is 'preferably fastened atoneend as by ascrew 23 to the shank while the ter jminal of theresilient portion is seated in a recess 24in the ;adjacent edge of theshort portion 5 of the jaw 4, the arrangement being indicated in Fig. 1o

With a view toward providing the improved means for fasteningthe jawsinvarious positions of adjustment, so that the wrench'inay be used fortightening the nuts 'et cetera an elongated set-screw is employed, theshank 25. thereofbeing adjust-ably mounted in a transverse opening 26which communicates With the opening 6 so that the inner end ofthe'threade'd shank may frictionally engagethe adjacent face of theshank 1 of the wrench upon the adjustment of the head ,27 of the screw,as is apparent. Normally however, this set-screw is not in engagementwith the shank 1 permittingof a free relative adjustment of the jaws 4and 14. In other words, by the peculiar construction and arrangement ofthe jaws they are al- Ways arranged in operative relation with respectto each other and it is only necessary to arrange the engaging faces 17and 12 of the jaws in engagement with an object such as a pipe sectionand swing the shank or handle '1 so that the cam head 3 will coact withthe cam faces 13 and 21 on the adjacent edges of the respective jaws tand 14 to maintain the said engaging faces in effective engagement onthe pipe section so that the -latteroanbe adjusted relative to anotherstationary pipe section (not shown), as is ap parent. In this connectionit is to be understood tha't'the swinging of the shank 1 causes apressure to be exerted on the inner movable jaw so that the latter willmove with the shank while at the same time the cam head will ride on thecam face 21 of the outer movable jaw to move this latter jaw in .anopposite direction or toward the engaging face 12 on the inner movablejaw 4, the relation between the jaws being such that the greater thepressure applied, the tighter the engagement of the j aws with theobject.

It is believed in view of the foregoing description that a furtherdetailed description of the operation of the invention is entirelyunnecessary. Likewise, it is believed that the advantages of theinvention will be readily apparent;

Still further embodiments. of the invention than those herein especiallydefined may be resorted to as conditions or preference may dictate, asmay be in'keeping with the hereto appended claims.

Having thus fully described the invention, what is claimed as new anddesired to be secured by Letters Patent is:

1. A device of the charcter described including a shank, a cam formedintegral with the outer end thereof and arranged diagonally thereof, aninner L-shaped jaw having the short portion slidably mounted on theshank and provided with a cam face for coacting with the cam. head,resilient means for holding the cam face in yielding engage- "ment withthe cam head,rand an L-shaped outer having its long portion slidably onthe inner edge of the long portion for coacting with the head uponmanipulation of the shank and being prevented from accidentaldisplacement by its relation to the cam head.

2. A device of the character described in cluding a shank, a cam head onone end thereof, an L-shaped inner jaw having an opening in the shortportion of the L=shaped jaw for sliclable disposition of the shank, theedge of the short portion of the jaw ad jacent the cam head beingdesigned to form a cam face, resilient means for holding said cam faceinsubstantially yieldingengagement with the shank, a substantially .L-shaped outer jaw having anopening in its shank for slidable dispositionabout the lated to the cam head that the cam head acts to preventaccidental displacement of the outer movable jaw from the inner jaw.

3. A device of the character described includin a shank, a cam head onone end thereo an L-shaped inner jaw having an opening in the shortportion of the L- shaped 'aw for slidable dispositon of the shank, t eedge of the short portion of the jaw adjacent the cam head beingdesigned to fprm a cam face, resilient means for holding said cam facein substantially yielding engagement with the shank, a substantiallyL-shaped outer jaw having an opening in its shank for slidable disposi-'tion about the long portion of the inner.

vided with a cam face for coacting with the and designed to hefrictionally' engaged earn head upon manipulation of the shank, with theshank at times for rigidly main- 10 and a cam face of the outer movablejaw tainingthe jaws in various positions of adbeing so related to thecam head that the justment. 5 own head acts to prevent accidental dislace- In testimony whereof, I aflix my signature ment of the outermovable jaw from t e in hereto.

ner jaw, and a set-screw mounted through i the short portion of theinner movable jaw LEE MURDOCK.

Copies of this patent may be obtained torflve cents each, by addressingthe Commissioner of Patents, Washington, I). C.

